Sofa



FIG. 1 is a perspective view of the sofa;

FIG. 2 is a front elevational view of the sofa;

FIG. 3 is a rear elevational view of the sofa;

FIG. 4 is a left side elevational view of the sofa, the opposite side of which is a mirror image;

FIG. 5 is a top plan view of the sofa; and,

FIG. 6 is a bottom plan view of the sofa. 

CLAIM The ornamental design for a sofa, as shown and described. 